About Universal Units Converter
A simple tool, built to stay simple.
Why this exists
Many converter sites bury the result under pop-ups, ask you to sign up or send everything you type to a server. Universal Units Converter does one thing differently: it converts length, mass, temperature, volume, area, speed and time instantly and for free, with nothing to sign up for and nothing that can later be put behind a paywall.
How the converter works
Your value is converted entirely inside your own browser, using the exact definitions of the units and standard JavaScript arithmetic. Nothing you type is ever transmitted to any server — not even anonymised. Once the page has loaded, you can disconnect from the internet and the converter works just the same.
How it stays free
This site is supported by advertising. There is no premium tier and no feature held behind a paywall — the ads are what make every part of the tool free and unlimited.
Privacy by design
The numbers you convert can say something about your life — your weight, a recipe, a floor plan. This tool was built so that it cannot see them: the code runs in your browser, the result stays in your browser, and no value leaves your device. There are no analytics that track which numbers you typed or which units you selected.
Part of the Universal family
Universal Units Converter is one of several free utility tools built on the same principle: solve one real problem well, keep it free, and respect your time. All tools share the same clean, fast design with no dark patterns, no upsells, and no friction.
Legal information
This site is operated by Fabian Kochendoerfer, based in Germany. Full legal details and the operator address for any formal postal correspondence are on the Imprint page.